(19)
(11) EP 0 088 204 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.07.1984 Bulletin 1984/28

(43) Date of publication A2:
14.09.1983 Bulletin 1983/37

(21) Application number: 83100068

(22) Date of filing: 05.01.1983
(84) Designated Contracting States:
DE GB

(30) Priority: 11.01.1982 JP 182682

(71) Applicant: Hitachi, Ltd.
 ()

(72) Inventors:
  • Yuhara, Akitsuna
     ()
  • Hosaka, Norio
     ()
  • Fujita, Yuji
     ()
  • Kishimoto, Kiyohara
     ()
  • Yamada, Jun
     ()

   


(54) Surface acoustic wave transmission device


(57) Disclosed is a surface acoustic wave transmission device comprising a piezoelectric substrate (1) provided thereon with an input (2) and output (3) transducers for transmitting and receiving the surface acoustic wave, a package (6) for accommodating the piezoelectric substrate, and an adhesion layer (5) for fixing the bottom of the piezoelectric substrate to the ground plane of the package. The adhesion layer is made to have a thickness of λR/2.6 or more (λR: the wave length of the surface acoustic wave at the main lobe of the operating frequency), so that unnecessary waves caused by bulk wave components are absorbed.






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